Cruz, Gerson Kleber de Almeida creator Pio, Nabor da Silveira creator Iwakiri, Setsuo creator text periodical abstract or summary bl. continuing eng ABSTRACT The objective of this work was to study the fiber length variation, retractability and basic density, in the core-bark direction and along the heig of the red tauari wood (Cariniana micrantha Ducke). The stem was evaluated in the discs, from core to bark, corresponding to 0%, 25%, 50%, 75% and 100%. At the commercial height of the tree the evaluation was carried out in the Base, DBH, 50%, 75% and 100%. Three trees were collected and 5 discs of 12 cm of thickness were taken from each tree the heights: Base, DAP, 50%, 75% and 100%. Results indicated that the fiber length increases in the radial direction core-bark and decreases in the longitudinal direction, from base to top. The analysis of the basic density varied in the core-bark direction, with tendency to increase from the position of 50% (heartwood), then decreasing in the sapwood region. Total volumetric and linear contractions decreased in the core-bark direction. Keywords: basic density, shrinkage, fiber. Publicação on-line; 29 ref.; 10 tables; 2 illus.; Summary (En) MADEIRA DENSIDADE DA MADEIRA FIBRA ESTRUTURA VEGETAL TAUARI Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0451 1415-0980 / ISSN 2179-8087 0nline BR2026000310 v. 26(3) p. 1-12; (2019) https://www.scielo.br/j/floram/a/H9VDpQWWGnJb9Yy5X3BTccp/?format=pdf&lang=en https://www.scielo.br/j/floram/a/H9VDpQWWGnJb9Yy5X3BTccp/?format=pdf&lang=en BR-BrBNA 260408 20260408052756.0 eng